About

This will allow plugging USB devices into virt/kvm guests dynamically using UDEV rules.

Allows mounting specific devices to specific guests or wildcard matching to bind all devices to a guest.

Install

Place 60-usb-libvirt.rules in /etc/udev/rules.d

Place libvirt-usb.sh in /etc/libvirt/

Place libvirt-usb.config in /etc/libvirt/

The config file lists devices by udev PRODUCT and the virt guest it should be attached too.

Devices will be bound to the guest on the FIRST match only and ignored if no matches.

Edit the libvirt-usb.config file with the format

PRODUCT:VIRT_HOST_NAME

For example the following defines two USB devices being added to seperate guests with a third entry adding all other devices to a third guest.

1010/415/312:media
1344/237/232:print_server
*:desktop

The * wildcard will match all USB devices plugged into the host and bind them to the given guest.

If there are no matches the device is passed through to the host as normal.

PRODUCT can be gotten using udevadm and plugging or removing the device and VIRT_HOST_NAME is the name of the guest in virsh list :

[user@host]$ udevadm monitor --subsystem-match=usb --property --udev | grep PRODUCT

PRODUCT=1050/407/512

If the guest we are adding to were called 'desktop' the line would be as follows for the above device:

1050/470/512:desktop